Valve-grinder.



H. M. NEER.

VALVE GRINDER.

APPLICATiON FILED MAY 6. 1915 latvntvd Nov. 23, 1915.

attorney rran sraarns ram HARRY M. NEER, 0F COLUMBUS, OHIO, ASSIG-NOR TO THE TURNBULL MANUFACTURING 1 COMPANY, OF COLUMBUS, OHIO, CORPORATION OF OHIO.

VALVE-GRINDER.

Snecificatioii of Letters Patent.

Application flied May 8, 1915. Serial No. 26,87 2.

that a perfect contact between the valvehead and its seat may be gotten. As iscustomary, these valves are given a rotary motions during successive rotations.

tion when a suitable grinding compound has been placed between their heads and the valve seat.

However, the main object of my invention resides in providing a type of structure wherein the valve head is given an oscillatory movement of a nature so that it will not seat itself each time in identical positions in order to avoid the grinding of ridges and'the likef A still further object of my invention resides in the provision of a structure whereby the valve head may be rotated or oscillated first in one direction and then in the other, the circular length of successive rotations being different in order to avoid the possibility of the valve seating itself in identical posi In this connection, it is also an object of the present invention to provide a structure for accomplishing the above by a continuous operation of the driving means in the same direction. Still a further object of my invention resides in the provision of a peculiar type of bevel gear designed tomesh with complemental pinions for accomplishing the results above outlined.

The preferred embodiment of my invention is shown in the accompanying sheet of drawings, in which similar characters of in which:

Figure 1 is a. central vertical section of.

my grinding tool, Fig. 2 is a side elevation of the structure shown in Fig. 1 and looking from 'the right, and, Fig. 3 is a face view of a bevel gear used by me. 4

In these several figures, there is shown an upstanding shaft designated 1, this shaft being. enlarged at its lower end as shown at '2 and bifurcatedto receive a suitable type of bit 3,- this bit being removably held in position by means of the pin 4. This shaft is'journaledln a suitable supporting struc ture or housing composed of a major section v5 and a cap 6, the major .portion 5 being provided with a suitable bearing 7 adjacent its underside, while its upper side is socketed as is shown at 8 to form a bearing place for this shaft 1. The upper portion of the supporting or housing structure is also provided with a hand grip of the nature shown at 9, it being intended that the grinder as a whole shall be held in position by one hand of the operator, so that the bit 3 may be in operative engagement with the valve head, While the other hand is free for use as will be presently related. Reference to Fig. 1 will also disclose that the shaft 1 rigidly carries a pair of bevel pinions 10 and 11, these pinions being rigidly held in position by means of pins 12 and being of slightly varying diameters. A lateral portion of the major portion 5 of the housing structure is also provided with a bearing hub such as is shown at 13, throughwhich the shaft 14 rotatably passes. At its outer end, the shaft carries a collar 15 to which a hand operating crank 16 .is rigidly attached while its Patented Nov. 23,1915.

inner end rigidly carries a bevel gear designated generally by the reference numeral 17 bymeans of thepin shown at 18. Reference to Fig. 3 will show this bevel gear in pinions 10 and 11 and in addition to these,

two small teeth 20 are provided one at each end of the circular array of teeth 19, these latter teeth 20 having a face length equal to the face of the teeth on the pinion 10 only. Again referring to Fig. 1, it will be noted that the arrangement of pinions 10 and 11 is such that the teeth on the pinion 1Q mesh with the teeth on the outer periphery of the gear 17, while the teeth on the pinion 11 mesh with the'teeth' on the inner periphery of the gear 17. Consequently, during the continued rotation of the operating shaft 14, the pinion 10 will mesh with all of the teeth 19 plus the two teeth 20,

while the pinion 11 will mesh with only the teeth designated 19, thereby giving the shaft 1 an additional rotation equal tothe distance of'thetwo teeth when the pinion 10 is in mesh than when the pinion 11 is in Inesh- It will also be noted that these "teeth 19 and 20 cover an are slightly less than half the circumference of the gear 16,whereby the valve head may be given sufiicient time to come to an actual stop before its rotation in the opposite direction without the accompaniment of a shock.

From the foregoing description taken in connection with the accompanying drawing, it will be apparent that l have provided a type of valve grinding tool wherein the valve head may be givena' circular movement first in-one direction and then in the 7 other by a continuous rotation of the operating crank 16. At the same time, the circular length of rotation in opposite directions is of unequal lengths whereby the valve head will not come to rest successively in identical positions and in this manner the grinding of ridges, etc., is avoided.

lVhat I claim, is:

1. In a valve grinder, an upstanding shaft, a supporting structure" therefor, a bit carried by said shaft, a pair of bevel pinions carried by said shaft, and a bevel gear arranged to mesh with said pinions, said gear being provided with a set of teeth for each pinion. and one set being greater in number than the other set whereby said shaft is re tated first in one direction and then in the other, the arcs of rotation being of difierent circular lengths.

2. In a valve grinder, an upstanding shaft, a supporting structure therefor, a bit carried by said ,shaft,'a pair of bevel pinions carried by said shaft, and a bevel gear arranged to mesh with said pinions, said gear being provided with a set of teeth for each pinion whereby said shaft is rotated first'in one direction and then in the other. I

3. In a valve grinder, an upstandin'gshaft,

a supporting structure therefor, a bit car ried by said shaft, a pair of bevel pinions of different diameters carried by said shaft, and a bevel gear arranged to mesh with said pinions, said gear being provided with a set of teeth covering a portion of its circumference only, certain of said teeth being of a length to mesh with either of said pinions and the remainder being of a length to mesh with only one of said pinions, said pinions being so arranged that only one of them is in mesh with said gear at 'one time.

In testimony whereof I afiiX my signature witnesses.

in presence of two HARRY M. NEER.

Witnesses:

WALTER E, L. BOCK, A. L. PHELPS. 

